HALLIBURTON ENERGY SERVICES, INC.
H.A.S. PREMIER HEALTHCARE GROUP
HEALTH ADMINISTRATION SERVICES (HAS)
HEALTH ECONOMICS CORP (HEC)
HEALTHSMART
HUMANA
INTEGRATED MEDICAL (IMS)
INTERPLAN HEALTH GROUP (IHP)
MAIL HANDLERS BENEFIT PLAN
MEDCORP
MEDICARE
MEDICUS
MHHNP (MEMORIAL HERMAN HEALTH NETWORK)
MONTGOMERY ISD
MULTIPLAN PPO
NATIONAL HEALTHCARE ALLIANCE
NATIONAL PROVIDER NETWORK (NPN)
ONE HEALTH PLAN OF TEXAS/ GREAT WEST
PACIFICARE
PHCS (PRIVATE HEALTH CARE SYSTEMS ( ALL
PLANS UNDER PHCS)
PLANVISTA (NPPN)
PPO NEXT